Settings: Implement System resource controls (CPU/Memory/Admin/Rosetta)

[AprilNEA]

The System Settings view has UI controls for resource limits and environment options that require backend gRPC support to function:

• Memory limit slider (1–14 GiB)
• CPU limit slider
• Admin privileges toggle
• Rosetta toggle
• Apply and Restart button

These controls are currently commented out in SystemSettingsView.swift with TODO references to this issue. They should be wired up once the daemon exposes resource configuration APIs.

[linear]

ABXD-87

[linear-code]

from shuo:

PR #273 replaces the previously planned Rosetta toggle (#196): amd64 translation now follows the backend choice (VZ → Rosetta, HV → FEX).

[KafuChino123]

PR #273 replaces the previously planned Rosetta toggle (ABXD-87): amd64 translation now follows the backend choice (VZ → Rosetta, HV → FEX).